Backpack cooler



FIG. 1 is a perspective view showing my new backpack cooler;

FIG. 2 is a left side view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a back view thereof;

FIG. 6 is a top view; and,

FIG. 7 is a bottom view. 

CLAIM The ornamental design of a backpack cooler, as shown and described. 